Acknowledgment

I have borrowed the above problem from the Romanian Mathematical Magazine where it appeared under the caption "Russian Inequality - 2" with three solution: Solution 1 by Rovsen Pirkuliyev (Azerbaidjian); Solution 2 by Myagmarsuren Yadamsuren (Mongolia); Solution 3 by Marian Dinca (Romania). The inequality is weak. Proof 4 highlights the way in which it can be improved and generalized.